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Top Forums UNIX for Dummies Questions & Answers Search a string in the file and then replace another string after that position Post 302529718 by alister on Friday 10th of June 2011 07:45:20 AM
Old 06-10-2011
Quote:
Originally Posted by yazu
Code:
% cat testfile | sed '/Hello/ n; s/Name/IDENTITY/'

Quote:
Originally Posted by dashing201
@yazu: Thanks for the quick reply.However I wanted to change just the next occurrence of the string after "SEARCH" string is found.In the one you suggested , it is changing all the occurrence.However still it was helpful. Smilie
He should have grouped the commands:
Code:
sed '/Hello/ {n; s/Name/IDENTITY/;}'

And judging from the sample data, it'd be a good idea to anchor the regular expressions to the beginning of the line.

Regards,
Alister
This User Gave Thanks to alister For This Post:
 
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ppmtopgm(1)						      General Commands Manual						       ppmtopgm(1)

NAME
ppmtopgm - convert a portable pixmap into a portable graymap SYNOPSIS
ppmtopgm [ppmfile] DESCRIPTION
Reads a portable pixmap as input. Produces a portable graymap as output. The output is a "black and white" rendering of the original image, as in a black and white photograph. The quantization formula used is .299 r + .587 g + .114 b. Note that although there is a pgmtoppm program, it is not necessary for simple conversions from pgm to ppm , because any ppm program can read pgm (and pbm ) files automatically. pgmtoppm is for colorizing a pgm file. Also, see ppmtorgb3 for a different way of converting color to gray. And ppmdist generates a grayscale image from a color image, but in a way that makes it easy to differentiate the original colors, not necessarily a way that looks like a black and white photograph. QUOTE
Cold-hearted orb that rules the night Removes the colors from our sight Red is gray, and yellow white But we decide which is right And which is a quantization error. SEE ALSO
pgmtoppm(1),ppmtorgb3(1),rgb3toppm(1),ppmdist(1),ppm(5),pgm(5) AUTHOR
Copyright (C) 1989 by Jef Poskanzer. 10 April 2000 ppmtopgm(1)

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